Frosty temperatures pressed much of the country this week, thanks to Arctic temperatures ushered in by the polar vortex.
The deep freeze claimed at least 21 lives, suspended operations at General Motors plants, delayed some Amazon deliveries and grounded more than 1,500 flights.
It was a remarkable week of weather on the ground, and it looks that way from space too: Images captured by NASA and NOAA, the National Oceanic and Atmospheric Administration, are equal parts humbling and awe-inspiring.
The satellite image embedded above, from the NOAA Environmental Visualization Laboratory, shows rows of clouds over the Great Lakes. The image was taken on Sunday, Jan. 27.
"When extremely cold air moves over the unfrozen, relatively warmer lake water, columns of heated air begin to rise off the lake surface. As the rising, warmer air hits the cold air above it, the moisture condenses into cumulus clouds, then cools and sinks on either side," the NOAA ex...